Butterfly catchers (4)
I believe the answer is:
nets
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">butterfly catchers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nets that I've seen before include "Catches (fish)" , "Meshes to catch fish, say" , "'Traps for 29 dn, say (4)'" , "Brings home" , "Practice pitches (cricket)" .)